for data, null may be returned, you can also use avistreamfindsample to find the specified sample by specifying the find_any flag. Find the key samples and use the avistreamfindsample function to find the sample that matches the search. Then, you can use the following macro to determine whether the key samples are used. The function of switching avistreamsampletotime between time and sample can convert smaple to milliseconds. For a video, this value
Recently, due to the need to convert some videos from the FLV format to the AVI format, I wrote the following script to automate the conversion:
#! /Bin/bashffcmd = '/cygdrive/C/work-DIR/FFMPEG/ffmpeg.exe' # path to ffmpe tools # Check output directory existif! Test-d $2; then mkdir $ 2FI # Convert FLV to avifor F in $ (ls $1 /*. FLV); do if test-F $ F then ECHO
); endclear II I _img sizex sizey sizez filelist % step4: Get the image information, convert it to Avi, and save % to get all the files in the folder filelist = getallfiles (desname); % number of images img_num_out = length (filelist); If img_num_out = 0 | img_num_out ~ = Img_num error ('the number of images in the specified folder is incorrect. Please check agai
Now many friends of mobile phone support video to watch movies, but most mobile phones only support 3GP format, and if the software conversion, RM can not support the conversion to 3GP format, you must first convert to AVI or MPEG format to convert to 3GP files.
Here, I'd like to show you how to
An AVI file is a multimedia file. An Avi image is a video image. It is a riff description file used to obtain, edit, and demonstrate audio and video sequences. A general AVI file contains audio streams and video streams. Some special AVI files also contain a control path or
Because many teaching videos are in the CSF format, they cannot be played on mobile phones, P5, or some players, and sometimes we want to use the video acceleration function, however, these conditions are not supported for videos in the CSF format, so in many cases we need to convert them to other video formats. The following shows how to convert videos in AVI fo
1. First download FFMPEG
2. decompress the decompressed ffmpeg.exe and pthreadgc2.dll files to any directory (of course, it can also be a directory in webroot)
3. Create the BAT file convertvideo. BAT and add the following content: (for parameter descriptions, see Appendix 1)
[TXT]View plaincopy
% 1/FFMPEG-I % 2-y-AB 56-ar 22050-B 500-R 15-s 320 * 240% 3
Exit
******************
% 1 is the FFMPEG storage directory
% 2 is the file path to be conve
converting different media files and codec. For more information about each parameter, see FFMPEG manual. However, FFMPEG still has many problems: for example, many codec still do not support it, such as wmvv3 (wmv9) and wmav3 (wma9. There are also many codec that only provide decoder, but not encoder. This is also very painful for conversion, but it is nothing for playing. There are also some bugs, such as the above command line, when converting to
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